* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.w {
    width: 80%;
    margin: 0 auto;
}

a {
    text-decoration: none;
    color: whitesmoke;
}

em,
i {
    font-style: normal;
}

ul {
    list-style: none;
}

img {
    border: 0;

}

nav {
    display: flex;
    width: 100%;
    height: 50px;
    background-color: rgb(22, 22, 22);
    justify-content: space-between;
    position: fixed;
    right: 0;
    left: 0;
    z-index: 1030;
}

nav .nav-1 ul,
nav .nav-2 ul
{
    display: flex;
    line-height: 50px;
}

nav .nav-1 ul li a{
    margin: 0 30px;
    color: rgb(152, 152, 152);
}

nav .nav-1 ul .li-1 {
    background-color: rgb(76, 76, 76);
}

nav .nav-1 ul .li-1 a {
    color: #fff;
}

nav .nav-1-li4 {
    color: rgb(152, 152, 152);
    cursor: pointer;
}

nav .nav-1 ul li a:hover,
.nav-1-li4:hover {
    color: white;
}

nav .nav-2 ul li i {
    margin: 0 20px;
    font-size: 30px;
    color: rgb(152, 152, 152);
    cursor: pointer;
}

nav .nav-2 ul #input {
    display: none;
    padding: 10px;
    outline: none;
    position: absolute;
    top: 20px;
    right: 150px;
}

nav .nav-2 ul li i:hover {
    color: white;
}

body {
    position: relative;
    top: 0;
    left: 0;
}

.support {
    display: none;
    position: absolute;
    top: 50px;
    left: 0;
    width: 100%;
    height: 50px;
    background-color: rgba(255, 255, 255, .6);
}

.support-1 {
    width: 200px;
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-around;
}

.support-1 h4 {
    cursor: pointer;
}

.header {
    width: 100%;
    height: 1000px;
    background-repeat: no-repeat;
    background: url(../imgs/tsna_pc.jpg);
    background-position: top;
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}


.title h1 {
    color: #fff;
    font-size: 86px;
}

.title-2 h3 {
    margin-top: 40px;
    color: #fff;
    font-size: 24px;
}

.title-3 {
    width: 180px;
    height: 45px;
    background-color: rgb(40, 97, 127);
    border-radius: 5%;
    box-shadow: 0 4px 18px rgba(0,0,0,.6);
    position: relative;
    top: 200px;
    left: 0;
}

.title-3 h2 {
    color: #fff;
    font-size: 18px;
    line-height: 45px;
    text-align: center;
}

menu {
    width: 100%;
    height: 150px;
    background-color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

menu h1 {
    color: #fff;
    font-size: 30px;
    text-align: center;
    padding: 0 20px 0 20px;
    border-left: 10px solid #999;
    border-right: 10px solid #999;
}

.content {
    display: flex;
    align-items: center;
    justify-content: space-around;
    background-color: #000;
}

.content .img-left {
    width: 736px;
    height: 380px;
}

.content .img-left img {
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.content .img-right {
    width: 736px;
    height: 380px;
}

.content .img-right img {
    width: 100%;
    height: 100%;
    cursor: pointer;
}

menu .menu-2 {
    width: 100%;
    height: 150px;
    background-color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

menu .menu-2 h1 {
    color: #000;
    font-size: 30px;
    text-align: center;
    padding: 0 20px 0 20px;
    border-left: 10px solid #999;
    border-right: 10px solid #999;
}

.news {
    width: 100%;
    height: 760px;
    display: flex;
    flex-direction: row;
}

.news-1 {
    width: 100%;
    height: 248px;
    display: flex;
    justify-content: space-between;
    flex-direction: row;
}

.news h3 {
    color: #000;
    font-size: 18px;
    margin-bottom: 10px;
    margin-left: 10px;
}

.news i {
    margin-left: 10px;
}

.news p {
    margin-top: 10px;
    margin-left: 10px;
    color: #000;
    font-size: 14px;
}

.news img {
    cursor: pointer;
}

.news-2 {
    width: 100%;
    height: 248px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-direction: row;
}

.news-3 {
    width: 100%;
    height: 248px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-direction: row;
}












footer {
    width: 100%;
    height: 450px;
    background-color: #000;
    background-position: bottom;
    background-size: cover;
}

.footer-1 {
    position: relative;
    top: 40px;
    left: 0;
    width: 100%;
    height: 175px;
    border-top: 1px solid #888;
    border-bottom: 1px solid #888;
}

.contact-us {
    margin: 70px auto;
    width: 400px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: space-around;
}

.footer-1 img {
    width: 50px;
    height: 50px;
}


.footer-2 {
    position: relative;
    top: 50px;
    left: 0;
    width: 100%;
    text-align: center;
    padding: 0 30px 0 30px;

}

.footer-2 h2 {
    color: #fff;
    margin-top: 10px;
    margin-bottom: 20px;
    font-size: 16px;
}

.footer-2 a {
    font-size: 12px;
    color: #999;
}

.footer-2 a:hover {
    color: #fff;
}

.footer-2 .p-2 {
    font-size: 14px;
    color: #999;
}
